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Name one ore each of manganese and chrom...

Name one ore each of manganese and chromium.

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The correct Answer is:
Mn=Pyrolusite,`MnO_(2)`
`Cr`=Chromite/ferrochromo,`FeO.Cr_(2)O_(3)`
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RESONANCE ENGLISH-D BLOCK ELEMENTS-EXERCISE-3 PART-III
  1. Of the ions Ag^(+),Co^(2+) and Ti^(4+) ,which ones will be coloured in...

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  2. Name one ore each of manganese and chromium.

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  3. In the transition series, with an increase in atomic number, the atomi...

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  4. Why Zr and Hf or Nb and Ta exhibit similar properties? Or Zirconium ...

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  5. Why among the lanthanides Ce,(III), can be easily oxidised to Ce(IV) (...

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  6. Explain why E^(@) for Mn^(3+)//Mn^(2+) couple is more positive than th...

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  7. What is the effect of increasing pH on K2Cr2O7 solution?

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  8. What is the basic difference between the electronic configurations of ...

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  9. Why do transition elements shows variable oxidation states?

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  10. Give reasons for each of the following: (i) Size of trivalent lantha...

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  11. The E^(@) value in respect of the electrodes chromium (Z=24), manganes...

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  12. The outer electronic configuration of two members of the lanthanoid se...

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  13. Assign reason for each of the following statement: (i) The largest n...

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  14. Write all possible oxidation states of an element having atomic number...

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  15. Why is +2 oxidation state of manganese quite stable while the same is ...

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  16. How is the variability in oxidation states of transition metals differ...

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  17. Write the electronic configuration of the element with atomic number 1...

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  18. (a) Describe the general trends in the following properties of the fir...

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  19. How would you account for the fact that the transition metals and thei...

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  20. Assign reasons for the following : (i) The enthalpies of atomisatio...

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